The invention is a permanent magnet biasing axial mixed magnetic bearing, relating to the technical field of electromechanical engineering, comprising axial control coils, rotor, rotating shaft, stator, permanent magnet, axial stator discs, and axial stator cylinder, where two axial control coils are connected in series and respectively arranged between two axial stator discs and arranged inside and close to the axial stator cylinder; the rotor is jacketed on the rotating shaft; radial stator and permanent are arranged inside the axial stator cylinder and a radial gap is formed between the radial stator and the rotor; two axial gaps are formed between two axial stator discs and the rotor; the two axial stator discs, axial stator cylinder, two axial gaps and rotor compose a complete control flux circuit; the permanent magnet is inserted between the axial stator cylinder and the radial rotor, and forms permanent magnet biasing magnetic circuit path together with the radial gap and the rotor through the two axial gaps, respectively. And the invention need not install a large axial suction disc on the rotating shaft, largely reducing moment of inertia of the rotor, and the structure is simple, and it is easy to install.